Ethernet кабель TIA/EIA 568A
На дворе 21-ый век, компьютеры кругом, а как располагать провода в кабеле Ethernet до сих пор дискутируют. Страшное дело. Расследование показало, что таки кабель надо делать TIA/EIA 568A (а не TIA/EIA 568B).
PS 8.0 Which Specification is Preferred?
If 568A and 568B specifications are technically identical and both are
international standards which one is preferred? The information here
is sketchy and I have not received a response from many standards
organizations, from what I can understand is that although 568B is
widespread (especially in the USA) all new installations should be
carried out using the TIA/EIA developed 568A. Standards Australia -
The Australian equivalent the ISO says, "There is no reason to change
existing 568B installations to 568A although all new installations
should be implemented with 568A." More recent information, "As
published in the EIA Commercial Building Draft 9.0 as the preferred
sequence for termination of UTP data cabling… This is also the
preferred option for AS/NZS 3080."
9.0 Conclusion
Historically 568B was the specification on choice due to its early
development and implemented base, but as the market and the political
climate has changed over the years 568A has become the more dominate
and preferred specification. This is only due to a desire by world
standards organizations to provide a specification as backwardly
compatible as possible. All new installations should be carried out
using the 568A standard and cables only to be terminated to 568B
specification on existing 568B systems.
http://www.ablecables.com.au/568avb.htm
PS http://en.wikipedia.org/wiki/TIA/EIA-568-A